نتایج جستجو برای: tlc fid

تعداد نتایج: 7094  

2012
Veronika Javůrková Arnošt Leoš Šizling Jakub Kreisinger Tomáš Albrecht

Escape enables prey to avoid an approaching predator. The escape decision-making process has traditionally been interpreted using theoretical models that consider ultimate explanations based on the cost/benefit paradigm. Ultimate approaches, however, suffer from inseparable extra-assumptions due to an inability to accurately parameterize the model's variables and their interactive relationships...

2012
Hui-Jeon Jeon Hyeon-Son Choi OK-Hwan Lee You-Jin Jeon Boo-Yong Lee

Gelidium (G.) elegans is a red alga inhabiting intertidal areas of North East Asia. We examined anti-oxidative and anti-inflammatory effects of G. elegans, depending on drying and extraction conditions, by determining reactive oxygen species (ROS) and nitric oxide (NO) in 3T3-L1 and RAW 264.7 cells. Extraction yields of samples using hot air drying (HD) and far-infrared ray drying (FID) were si...

Journal: :Journal of chromatographic science 2009
Stephen B Stanfill Lily T Jia David J Ashley Clifford H Watson

In recent years, there has been a rapid proliferation of smokeless products with a wide range of nicotine content and flavoring formulations that may appeal to new users and existing cigarette smokers. The CDC nicotine method, which employs gas chromatography-flame ionization detection (GC-FID), provides a robust means for measuring nicotine in smokeless tobacco. However, several compounds, ide...

2017
Ulrich R. Bernier Christopher L. Bray Richard A. Yost

Vacuum-outlet operation of short fused-silica open tubular columns for gas chromatography provides benefits to analysis speed by increasing the optimum velocity while minimizing the loss in resolution. Vacuum-outlet operation of a column with a gas chromatographic detector necessitates that the detector also be under vacuum. Simple modifications were made to a gas chromatograph]flame Ž . ioniza...

2013
Omid Sedighi Atieh Makhlough Ghasem Janbabai Mohammad Neemi

BACKGROUND Functional iron deficiency (FID) may cause erythropoietin resistance in patients under hemodialysis (HD). Since the role of chronic inflammation or oxidative stress in its pathogenesis is unclear, controversy remains to whether intravenous iron or intravenous ascorbic acid (an antioxidant) can improve this anemia due to decreased iron availability. OBJECTIVES The current study comp...

Journal: :Physical review letters 2011
Kirill Prozument Anthony P Colombo Yan Zhou G Barratt Park Vladimir S Petrović Stephen L Coy Robert W Field

Transitions between Rydberg states of Ca atoms, in a pulsed, supersonic atomic beam, are directly detected by chirped-pulse millimeter-wave spectroscopy. Broadband, high-resolution spectra with accurate relative intensities are recorded instantly. Free induction decay (FID) of atoms, polarized by the chirped pulse, at their Rydberg-Rydberg transition frequencies, is heterodyne detected, average...

Journal: :Journal of chromatographic science 2000
T Cserháti E Forgács M Candeias L Vilas-Boas R Bronze I Spranger

The soluble color pigments of raisin are separated by reversed-phase thin-layer chromatography (TLC), and the capacity of TLC-Fourier transform infrared (FTIR) with both on-line and off-line coupling is assessed for the identification of the main fraction. TLC has also been used as a pilot technique for the development of a gradient elution method for the separation of pigments by high-performa...

2017
Qiran Sheng Joseph C Neaverson Tasnim Mahmoud Clare E M Stevenson Susan E Matthews Zoë A E Waller

i-Motifs are quadruplex DNA structures formed from sequences rich in cytosine and held together by intercalated, hemi-protonated cytosine-cytosine base pairs. These sequences are prevalent in gene promoter regions and may play a role in gene transcription. Targeting these structures with ligands could provide a novel way to target genetic disease but there are very few ligands which have been s...

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